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Civil Engineering/Plate thickness calculation for a Wall Plate

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Expert: - 12/2/2005


Question
Dear Arshad,

I have been trying to find out the best way to calculate plate thickness of an embeded wall plate with nelson studs. Only a gravity beam to be connected to this wall plate with shear tab. Therefore, this wall plate will get only shear force from beam (with 75mm eccentricity). I did figure out cone capacity for the nelson studs, but cannot get passed plate thickness question. I have this case that 3 rows by 2 columns of nelson studs, say 150mm between columns and 125 between rows. How I did it was Vf (from beam) x 75mm (eccen.) = Mf, then Mf / 2x125mm (1.row to 3.row)= Tf, then Tf x 150mm/4 = Mf (as point load on a simple beam). Then, Mf=phi x Fy x Zx. Zx=bt^2/4. By doing so, I am getting 1 1/4" thick plates which I am sure it is incorrect. I truly appreciate your help on this issue.

Regards,

Answer
Hi Adam,

Your principle seems OK, but I do not know what a nelson stud is, nor it's diameter. Have you taken account that the punching shear circumference is larger than that of the stud? Also, you can mitigate the problem by perhaps introducing thick washers?

I hope that helps!

Kind regards,

Arshad

Civil Engineering

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Arshad Khan

Expertise

I can answer any questions to do with civil and structural engineering consultancy and construction industry in East Africa and the Middle East, and specifically with the analysis and design of reinforced concrete structures. My particular expertise is in the aseismic design and optimisation of tall buildings.

Experience

Employment history: 36 years in Construction and consultancy in the UK, Kenya, Tanzania, Uganda, Ethiopia, Eritrea, South Africa, Somalia, Zambia, Austria, Bahrain, Kuwait, Doha and the U.A.E.

Organizations
.Fellow of Institution of Structural Engineers (UK) .Fellow of Institution of Civil Engineers(UK) .Member of the Institution of Engineers, Kenya .Registered Engineer, ERB, Kenya .Member of the Architectural Association of Kenya (Engineers Chapter) .Chartered Engineer (UK)

Publications
•1984: International Conference on the Art and Practice of Structural Design, London •1994: 3rd Int. Kerensky Conference in Structural Engineering, Singapore •2008: International Conference on High-Rise Towers, Abu Dhabi

Education/Credentials
BSc, 1st Class Hons, in Building Engineering, University of Bath, UK MSc in Concrete Structures and Technology, University of London. Diploma of Imperial College, UK.

Awards and Honors
•Science Congress Special Award (for 2-seater Hovercraft - 1968) •Institution of Civil Engineers Award for outstanding performance at Bath University (1975) •Concrete Society Postgraduate study Bursary Award (1976) •Consular Representative for British High Commission, Nairobi. (1995 to 1998) •Examiner for Institution of Civil Engineers Professional Interviews, Nairobi. (1997 to 1998) •Branch Representative in Vienna for PI assessment for Inst. of Struct. Engrs. (1999 to date)

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